This standard is equivalent to international standards IEC455 (1988) "equipment specific wire line terminals and terminal identification and application of general rules for an alphanumeric system." Scope This standard specifies the method for identifying a variety of electrical equipment (hereinafter referred to as the device) terminals, and developed a system of alphanumeric identification equipment terminals and specific wire line side of General. The main consideration is the structure of the contact pressure plate and lead the needle, needle and tablet lead exposure, mostly in line contact, which resulted in the plug at the moment with the sudden emergence of large, and then suddenly becomes smaller, the computer chassis, power supply line, to customers in the use of a very unstable feeling, chassis power lines affect their life, if the contact pressure plate and lead the needle into surface contact with the structure, then it not only solves the insertion force Problems also reduces the contact resistance and temperature rise. Poor insulation insulator role is to maintain the correct position of the contact arrangement, and contact between the contact member and insulated from each other between the contact and the housing. Therefore insulating member must have excellent electrical properties, mechanical properties and molding process performance. Especially with the effective thickness of high-density, extensive use of small terminals, insulators increasingly slim. This insulation material, plastic injection molding and other precision molds and made more restrictive and burdensome requirements. Due to the presence of the insulator surface or inside metal extra material, surface dust, moisture and other pollution flux, organic material precipitates and harmful gas adsorption film with the surface water film fused to form ion conductive channels, moisture absorption, chassis power line shorted, mildew, aging of insulation materials and other reasons, will cause a short circuit, leakage, breakdown, poor insulation and low insulation resistance. Chassis power line installation, the chassis power lines, Xu Chong-electronic products factory by the Dongguan Shijie Xu Chong-electronic products factory provided. Dongguan Shijie Xu Chong-electronic products plant (chuangxs.1688.com) (www.chuangxs.1688.com) strong, credible, connectors, and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Xu Song Chong electronic products factory into the brilliant and you work for a better future!